include/net/caif/caif_hsi.h

   1 /*
   2  * Copyright (C) ST-Ericsson AB 2010
   3  * Author:  Daniel Martensson / daniel.martensson@stericsson.com
   4  *          Dmitry.Tarnyagin  / dmitry.tarnyagin@stericsson.com
   5  * License terms: GNU General Public License (GPL) version 2
   6  */
   7
   8 #ifndef CAIF_HSI_H_
   9 #define CAIF_HSI_H_
  10
  11 #include <net/caif/caif_layer.h>
  12 #include <net/caif/caif_device.h>
  13 #include <linux/atomic.h>
  14
  15 /*
  16  * Maximum number of CAIF frames that can reside in the same HSI frame.
  17  */
  18 #define CFHSI_MAX_PKTS 15
  19
  20 /*
  21  * Maximum number of bytes used for the frame that can be embedded in the
  22  * HSI descriptor.
  23  */
  24 #define CFHSI_MAX_EMB_FRM_SZ 96
  25
  26 /*
  27  * Decides if HSI buffers should be prefilled with 0xFF pattern for easier
  28  * debugging. Both TX and RX buffers will be filled before the transfer.
  29  */
  30 #define CFHSI_DBG_PREFILL               0
  31
  32 /* Structure describing a HSI packet descriptor. */
  33 #pragma pack(1) /* Byte alignment. */
  34 struct cfhsi_desc {
  35         u8 header;
  36         u8 offset;
  37         u16 cffrm_len[CFHSI_MAX_PKTS];
  38         u8 emb_frm[CFHSI_MAX_EMB_FRM_SZ];
  39 };
  40 #pragma pack() /* Default alignment. */
  41
  42 /* Size of the complete HSI packet descriptor. */
  43 #define CFHSI_DESC_SZ (sizeof(struct cfhsi_desc))
  44
  45 /*
  46  * Size of the complete HSI packet descriptor excluding the optional embedded
  47  * CAIF frame.
  48  */
  49 #define CFHSI_DESC_SHORT_SZ (CFHSI_DESC_SZ - CFHSI_MAX_EMB_FRM_SZ)
  50
  51 /*
  52  * Maximum bytes transferred in one transfer.
  53  */
  54 #define CFHSI_MAX_CAIF_FRAME_SZ 4096
  55
  56 #define CFHSI_MAX_PAYLOAD_SZ (CFHSI_MAX_PKTS * CFHSI_MAX_CAIF_FRAME_SZ)
  57
  58 /* Size of the complete HSI TX buffer. */
  59 #define CFHSI_BUF_SZ_TX (CFHSI_DESC_SZ + CFHSI_MAX_PAYLOAD_SZ)
  60
  61 /* Size of the complete HSI RX buffer. */
  62 #define CFHSI_BUF_SZ_RX ((2 * CFHSI_DESC_SZ) + CFHSI_MAX_PAYLOAD_SZ)
  63
  64 /* Bitmasks for the HSI descriptor. */
  65 #define CFHSI_PIGGY_DESC                (0x01 << 7)
  66
  67 #define CFHSI_TX_STATE_IDLE                     0
  68 #define CFHSI_TX_STATE_XFER                     1
  69
  70 #define CFHSI_RX_STATE_DESC                     0
  71 #define CFHSI_RX_STATE_PAYLOAD                  1
  72
  73 /* Bitmasks for power management. */
  74 #define CFHSI_WAKE_UP                           0
  75 #define CFHSI_WAKE_UP_ACK                       1
  76 #define CFHSI_WAKE_DOWN_ACK                     2
  77 #define CFHSI_AWAKE                             3
  78 #define CFHSI_WAKELOCK_HELD                     4
  79 #define CFHSI_SHUTDOWN                          5
  80 #define CFHSI_FLUSH_FIFO                        6
  81
  82 #ifndef CFHSI_INACTIVITY_TOUT
  83 #define CFHSI_INACTIVITY_TOUT                   (1 * HZ)
  84 #endif /* CFHSI_INACTIVITY_TOUT */
  85
  86 #ifndef CFHSI_WAKE_TOUT
  87 #define CFHSI_WAKE_TOUT                 (3 * HZ)
  88 #endif /* CFHSI_WAKE_TOUT */
  89
  90 #ifndef CFHSI_MAX_RX_RETRIES
  91 #define CFHSI_MAX_RX_RETRIES            (10 * HZ)
  92 #endif
  93
  94 /* Structure implemented by the CAIF HSI driver. */
  95 struct cfhsi_cb_ops {
  96         void (*tx_done_cb) (struct cfhsi_cb_ops *drv);
  97         void (*rx_done_cb) (struct cfhsi_cb_ops *drv);
  98         void (*wake_up_cb) (struct cfhsi_cb_ops *drv);
  99         void (*wake_down_cb) (struct cfhsi_cb_ops *drv);
 100 };
 101
 102 /* Structure implemented by HSI device. */
 103 struct cfhsi_ops {
 104         int (*cfhsi_up) (struct cfhsi_ops *dev);
 105         int (*cfhsi_down) (struct cfhsi_ops *dev);
 106         int (*cfhsi_tx) (u8 *ptr, int len, struct cfhsi_ops *dev);
 107         int (*cfhsi_rx) (u8 *ptr, int len, struct cfhsi_ops *dev);
 108         int (*cfhsi_wake_up) (struct cfhsi_ops *dev);
 109         int (*cfhsi_wake_down) (struct cfhsi_ops *dev);
 110         int (*cfhsi_get_peer_wake) (struct cfhsi_ops *dev, bool *status);
 111         int (*cfhsi_fifo_occupancy) (struct cfhsi_ops *dev, size_t *occupancy);
 112         int (*cfhsi_rx_cancel)(struct cfhsi_ops *dev);
 113         struct cfhsi_cb_ops *cb_ops;
 114 };
 115
 116 /* Structure holds status of received CAIF frames processing */
 117 struct cfhsi_rx_state {
 118         int state;
 119         int nfrms;
 120         int pld_len;
 121         int retries;
 122         bool piggy_desc;
 123 };
 124
 125 /* Priority mapping */
 126 enum {
 127         CFHSI_PRIO_CTL = 0,
 128         CFHSI_PRIO_VI,
 129         CFHSI_PRIO_VO,
 130         CFHSI_PRIO_BEBK,
 131         CFHSI_PRIO_LAST,
 132 };
 133
 134 struct cfhsi_config {
 135         u32 inactivity_timeout;
 136         u32 aggregation_timeout;
 137         u32 head_align;
 138         u32 tail_align;
 139         u32 q_high_mark;
 140         u32 q_low_mark;
 141 };
 142
 143 /* Structure implemented by CAIF HSI drivers. */
 144 struct cfhsi {
 145         struct caif_dev_common cfdev;
 146         struct net_device *ndev;
 147         struct platform_device *pdev;
 148         struct sk_buff_head qhead[CFHSI_PRIO_LAST];
 149         struct cfhsi_cb_ops cb_ops;
 150         struct cfhsi_ops *ops;
 151         int tx_state;
 152         struct cfhsi_rx_state rx_state;
 153         struct cfhsi_config cfg;
 154         int rx_len;
 155         u8 *rx_ptr;
 156         u8 *tx_buf;
 157         u8 *rx_buf;
 158         u8 *rx_flip_buf;
 159         spinlock_t lock;
 160         int flow_off_sent;
 161         struct list_head list;
 162         struct work_struct wake_up_work;
 163         struct work_struct wake_down_work;
 164         struct work_struct out_of_sync_work;
 165         struct workqueue_struct *wq;
 166         wait_queue_head_t wake_up_wait;
 167         wait_queue_head_t wake_down_wait;
 168         wait_queue_head_t flush_fifo_wait;
 169         struct timer_list inactivity_timer;
 170         struct timer_list rx_slowpath_timer;
 171
 172         /* TX aggregation */
 173         int aggregation_len;
 174         struct timer_list aggregation_timer;
 175
 176         unsigned long bits;
 177 };
 178 extern struct platform_driver cfhsi_driver;
 179
 180 /**
 181  * enum ifla_caif_hsi - CAIF HSI NetlinkRT parameters.
 182  * @IFLA_CAIF_HSI_INACTIVITY_TOUT: Inactivity timeout before
 183  *                      taking the HSI wakeline down, in milliseconds.
 184  * When using RT Netlink to create, destroy or configure a CAIF HSI interface,
 185  * enum ifla_caif_hsi is used to specify the configuration attributes.
 186  */
 187 enum ifla_caif_hsi {
 188         __IFLA_CAIF_HSI_UNSPEC,
 189         __IFLA_CAIF_HSI_INACTIVITY_TOUT,
 190         __IFLA_CAIF_HSI_AGGREGATION_TOUT,
 191         __IFLA_CAIF_HSI_HEAD_ALIGN,
 192         __IFLA_CAIF_HSI_TAIL_ALIGN,
 193         __IFLA_CAIF_HSI_QHIGH_WATERMARK,
 194         __IFLA_CAIF_HSI_QLOW_WATERMARK,
 195         __IFLA_CAIF_HSI_MAX
 196 };
 197
 198 struct cfhsi_ops *cfhsi_get_ops(void);
 199
 200 #endif          /* CAIF_HSI_H_ */